Indicates whether or not a sample has ever been read.
For each sample received, the middleware internally maintains a sample state relative to each DataReader. This sample state can have the following values:
The sample state will, in general, be different for each sample in the collection returned by read or take.
READ_SAMPLE_STATE= 0x0001 << 0¶
Sample has been read.
NOT_READ_SAMPLE_STATE= 0x0001 << 1¶
Sample has not been read.